It is the act performed after having anal sex with an under-aged person where you collect the fecal matter onto the tip (or helmet) of the penis and forcibly insert it into the mouth of said under-aged person while pinning their arms with your knees.

Jilly said she wanted to try something new so after her mom went to sleep, I rammed her up the hershey highway and before she could scream I flipped her over and gave her a dirty ramirez.